Frictional driving mechanism



(No Modei.)

J. M. MERROW.

FRIGTIONAL DRIVING MECHANISM. No. 392,818. Patented Nov. 13, 1888.

WITNESSES INVENTOR ATTORNEYS.

UNITED STATES PATENT OFFICE...

JOSEPH M. MERROW, OF MERROW, OONNEOTIOUT.

FRICTIONAL DRIVING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 392,818, dated November 13, 1888.

Original application filed January 18, 1886, Serial No. 188,912. Divided and this application filed January 30, 1888.

Serial No 262,359. (No model.)

.To all whom it may concern.-

Be it known that I, J osnPH M. Mnnnow, of Merrow, in the county of Tolland and State of Connecticut, have invented certain new and useful Improvements in Friction Driving Mechanism for Sewing-Machines, of which the following is a specification.

It is the object of my invention to attain means whereby sewing and similar light machines may be easily started and stopped. As is well known, it is necessary in the operation of many light machines, particularly some classes of sewing-machines, from the nature of the work being performed thereon, that the machine should be frequently stopped and started, that the starting should be easy or gradual, and that the machine should often be run very slowly. To this class of machines, or machines employed to perform the kind of work mentioned, my improvements have particular applicability.

It is also the object of my invention to provideimprovements whereby the driving means may be supported and operated entirely independent of the machine, so that the latter may be hinged to its support and swung upon its hinges, as is frequently necessary in the use of sewing-machines, without interfering with or disconnecting it from the driving means.

The annexed drawing, forming a part of this specification, is a side view showing the driving mechanism and also a portion of the machine, both attached to the table.

A is a pulley, provided on its face with leather or frictional covering a, and having the grade a of smaller diameter, said pulley being adapted to rotate upon the small journal shaft or axis a".

B is an angle-lever having the arms I) and b, which lever is fulcrumed upon the rod or shaft b", which red I) is connected with the hanger G. The rod D connects arm I) of the anglelever B with the treadle E.

The treadle is pivoted at c to the piece 0 screwed to the floor 0'.

F is a pulley mounted on the shaft f, which shaft runs in the upper end of the bearing G, said bearing Gr being screwed to the floor 0.

' Upon the pulley F is the belt II, which runs also upon the grade a of the pulley A, by

means of which belt H said pulley A is driven continuously.

I is the main operating-pulley of the machine J a mere fractional part only of which machine is shown in the drawing. The machine J' is provided at its rear with an ear or projection, j. The hanger 0 above mentioned is screwed to the table K, and is provided with the car or projection a, through which projection 0 and the corresponding projection, j, upon the machine J, passes the rod 0, thus forming a hinge at this point upon which the machine J-may be swung. Under the table Kis placed a small step, b, to limit the length of motion in one direction of the lever B.

The operation of my invention is as follows, namely: The pulley F is driven by any suit able means, and motion is communicated to the pulley A from said pulley F by means of the belt II. When the swinging end of the treadle E is pressed downward toward the floor c, the angle-lever B is swung upon its pivot b, and the leather-covered periphery a of the pulley A is carried into contact with the periphery of the main driven pulley I of the machine, which causes said pulley to rotate and thus operate other parts of the machine J. The belt H may be run quite loosely when the machine is not in operation, as the swinging motion of the pulley A has a tendency to tighten said belt H when the latter is placed at an angle, and is somewhat backward from the vertical line, either above or below the axisbflupon whichtheangle-leverBswings. Thetension or elasticity of the belt H when in the position shown will carry the drivingpulley A away from the driven pulley I when the foot is removed from the swinging end of the trcadle E.

With the improvements described. it will be seen that the driving means is, to all intents and purposes, pivoted or fulcrumed to its support, independent of the machine or driven de vices, so that the latter can be moved on its hinge without disturbing the former or disconnecting any of its parts therefrom, and that the machine may be started or stopped, with out jar or shock, with the utmost readiness.

It is obvious that the machine may be pivoted directly to the table K, instead. of to the IOO support for angle-lever B, the construction in I the two belt-pulleys, the said friction-pulley this regard shown being adopted for the sake being adapted to be brought into contact with of convenience and economy. the driving-pulley of a machine by depressing Having thus described myinvention,whatI the treadle and to be released from contact I 5 claim istherewith by releasing said treadle, substan- A driving mechanism comprising a belltially as set forth. crank lever With afrietion and a driven belt- JOSEPH M MERROW pulley hung upon the lower arm thereof, a treadle and connection between said treadle WVitnesses:

10 and the upper arm of said bell-erank lever, 21. FRANK I-I. ALLEN,

. driving-beltpulley, and an elastic beltbetween A. R. BEEBE. 

